Four previously described species of bomolochid copepods from fishes of the western Atlantic and eastern Pacific (A. asperatus, A. crevalleus, A. divaricatus, and A. nudiusculus) are transferred to a new genus, Acantholochus, with the description of an additional
new species, Acantholochus nasus. These five species are unique in that they all possess prominent, heavily sclerotized spines on the female exopod of leg 3. The presence of 2 ventral rostral hooks in the female separates this new genus from Holobomolochus.
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